Class 2 Lecture Demo

Agenda:

• Link to Agenda

Class 1 Student Submissions:

• Link to Submissions

Review of Latitude and Longitude:

• The ‘direction’ of Latitude & Longitude:

Direction of Lat/Lon

• Analogy to remember relationship of Latitude to Longitude:

Ladder Analogy

• Positioning/measurement of points via degrees:

Point Positioning on 3d sphere

• Decimal Degrees:

Coordinate Formatting

• Mapped Result:

OSM result

Lab 1:

• Insert latitude and longitude coordinate pair into Google Maps:

38.8897,-77.0089

Lab 2:

• Data Download

• QGIS lines of latitude, longitude.

Lines of Lat/Lon

Lab 3:

• Data Download

• FIRMS fire points delimited text > spatial points > county counts

FIRMS fire points

Lab 4:

• Precision

Precision, Scale & Output Length

Precision :)

Number Precision and Scale

QGIS Field Calculator

Length and Precision in QGIS

Lab 5:

• Direct Download for Lab 5 Demo

• 311 NYC OpenData filtering

• Navigate to 311 OpenData

311 Service Dataset

• Apply Filter Conditions

Filter Conditions = Latitude NOT blank | Manhattan | Graffiti

• Download data as .csv

• NYC 311 How To

Lab 6:

• Data Download

• lat/lon precision in Ukraine conflict data

Quick Map Services Plugin